Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/23287
Title: Rush-hour aromatic and chlorinated hydrocarbons in selected subway stations of Shanghai, China
Authors: Zhang, Y
Li, C
Wang, X
Guo, H 
Feng, Y
Chen, J
Keywords: Aromatic hydrocarbons
Chlorinated hydrocarbons
Methyl tert-butyl ether
Shanghai
Subway
Volatile organic compounds
Issue Date: 2012
Publisher: Elsevier
Source: Journal of environmental sciences, 2012, v. 24, no. 1, p. 131-141 How to cite?
Journal: Journal of environmental sciences 
Abstract: Air samples were collected simultaneously at platform, mezzanine and outdoor in five typical stations of subway system in Shanghai, China using stainless steel canisters and analyzed by gas chromatography-mass selective detector (GC-MSD) after cryogenic pre-concentration. Benzene, toluene, ethylbenzene and xylenes (BTEX) at the platforms and mezzanines inside the stations averaged (10.3 ± 2.1), (38.7 ± 9.0), (19.4 ± 10.1) and (30.0 ± 11.1) μg/m 3, respectively; while trichloroethylene (TrCE), tetrachloroethylene (TeCE) and para-dichlorobenzene (pDCB), vinyl chloride and carbon tetrachloride were the most abundant chlorinated hydrocarbons inside the stations with average levels of (3.6 ± 1.3), (1.3 ± 0.5), (4.1 ± 1.1), (2.2 ± 1.1) and (1.2 ± 0.3) μg/m 3, respectively. Mean levels of major aromatic and chlorinated hydrocarbons were higher indoor (platforms and mezzanines) than outdoor with average indoor/outdoor (I/O) ratios of 1.1-9.5, whereas no significant indoor/outdoor differences were found except for benzene and TrCE. The highly significant mutual correlations (p 0.01) for BTEX between indoor and outdoor and their significant correlation (p 0.05) with methyl tert-butyl ether (MTBE), a marker of traffic-related emission without other indoor and outdoor sources, indicated that BTEX were introduced into the subway stations from indoor/outdoor air exchange and traffic emission should be their dominant source. TrCE and pDCB were mainly from indoor emission and TeCE might have both indoor emission sources and contribution from outdoor air, especially in the mezzanines.
URI: http://hdl.handle.net/10397/23287
ISSN: 1001-0742
EISSN: 1878-7320
DOI: 10.1016/S1001-0742(11)60736-5
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